Data Sheet

4

APD Receiver Operating Specifications – Electrical

Parameter

Symbol

Value

Units

Notes

Min

Typical

Max

Data Rate

BR

0.125

2.667

4.25

Gb/s

Supply Voltage

V

CC_TX

3.13

3.3

3.47

V

Differential Output Swing

V

RXDIFF

370

2000

mV

Differential pk-pk. Note 1

Rise/Fall Time

T

140

ps

20% - 80% Note 1

Loss of Signal (Asserted)

V

OH

2

3.47

V

Output Voltage High

Loss of Signal (Negated)

V

OL

-0.3

0.8

V

Output Voltage Low

Notes:

[1] Test conditions: 100

Ω differential (from 100MHz to 2.5GHz); VRXDIFF = | (VRD+) – (VRD-) |

Parameter

Symbol

Min

Max

Unit

Notes

Time from rising edge of

TX_DISABLE Assert Time

t_off

20

ms

TX_DISABLE to when the optical

output falls below 10% of nominal

Time from falling edge of TX_DISABLE

TX_DISABLE Negate Time

t_on

20

ms

to when the modulated optical output

rises above 90% of nominal

Time to initialize, including

From negation of TX_FAULT/INT using

reset of TX_FAULT

t_init

300

ms

TX_DISABLE Optical power going to 90%

of final value

From power on to negation of TX

Startup time

t_startup

90

s

FAULT/INT, indicating laser temperature

has stabilised to within operating range.

TX_FAULT/INT Assert Time

t_fault

50

ms

Time from fault to TX_FAULT/INT on.

TX_DISABLE to Reset

t_reset

10

ms

Time TX_DISABLE must be held high to

reset TX_FAULT/INT

LOS Assert Time

t_los_on

100

us

Time from LOS state to RX LOS assert

LOS NegateTime

t_los_off

100

us

Time from non-LOS state to RX LOS

deassert

Serial ID Clock Rate

f_serial_clock

100

kHz

The DWDM SFP MSA document specifies the full details of the low speed electrical interface in Section 3, including timings

and both AC and DC requirements.

Table 1: I/O Timing for Hardware Control and Status Functions.

Low Speed Electrical Signal Timings